Bosch BPT-S 3 Manuel De Service page 222

104 | Help in the event of faults
Bosch BPT-S 3 / 3.68 / 4 / 4.6 | Operating manual
Just the Ready LED is permanently red: Temporary
inverter fault
The string inverter interrupts the feed to the grid if
there is an internal fault on the string inverter. In
addition, this fault can occur if the ambient
conditions are not maintained and the device cannot
function properly, for example, as a result of excess
temperature.
 Once the fault has been remedied (e.g. by cooling
down the device), the string inverter automatically
continues to work normally.
Just the Generator LED is permanently red: Faults
on the DC side
The string inverter interrupts the feed to the grid if
there is a fault on the PV generator on the DC side.
Have the PV generator checked for faults by a

qualified electrician. At the same time, pay attention
to any error messages that appear on the display.
Just the Grid LED is permanently red: Faults in the
AC grid
The string inverter interrupts the feed to the grid if
there is a fault on the grid on the AC side.
If there is a fault in the public power grid, the device

detects this fault due to the grid voltage or grid
frequency. The string inverter then switches itself
off.
Just the Communication LED is permanently red:
Faults in the communication with the string inverter
The string inverter does not interrupt the feed to the
grid if there is a communication fault, as this only
affects optional accessories and does not impair the
core functions of the device.
Check the connected accessories to ensure that

they are functioning correctly
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Bosch Power Tec GmbH